What Are The Advantages Of High Purity Graphite Products?
What are the advantages of high purity graphite products?
High purity graphite has been specially processed graphite, has the characteristics of corrosion resistance, good thermal conductivity and low permeability. Several advantages of high purity graphite products:
1. High temperature resistance: the melting point of graphite is 3850±50℃, the boiling point is 4250℃, even if the ultra-high temperature arc burning, the weight loss is very small, the coefficient of thermal expansion is very small. The strength of graphite increases with the increase of temperature. At 2000℃, the strength of graphite is doubled. During exothermic welding construction, the chemical reaction temperature of exothermic flux is very high, so the materials used in exothermic welding molds need to be resistant to high temperature.
2. Electrical and thermal conductivity: the electrical conductivity of high purity graphite is one hundred times higher than that of general non-metallic ore. The thermal conductivity is higher than steel, iron, lead and other metal materials. The thermal conductivity decreases with increasing temperature, even at extremely high temperatures, graphite becomes an adiabatic. Graphite conducts electricity because each carbon atom in graphite forms only three covalent bonds with other carbon atoms, and each carbon atom still retains one free electron to transport charge. In the construction of exothermic welding often need to weld a lot of points, the amount of construction is not small, the thermal conductivity of graphite can just meet this point, can not only high temperature resistance and rapid cooling.
3. Lubrication: high purity graphite graphite lubrication performance depends on the size of the graphite flake, the larger the flake, the smaller the friction coefficient, the better the lubrication performance.
4 Chemical stability: graphite at room temperature has good chemical stability, acid resistance, alkali resistance and resistance to organic solvent corrosion.
5 Plasticity: high purity graphite toughness is good, can be rolled into a very thin sheet. Exothermic welding sometimes needs a variety of joint forms of exothermic welding mold, the plasticity of high purity graphite can be manufactured into a variety of different models, specifications, forms of connection of exothermic welding mold.
6 thermal shock resistance: high purity graphite at room temperature can withstand the drastic changes in temperature without destruction, temperature mutation, the volume of graphite change little, will not produce cracks.